At the same time, there is a growing consensus among reporters and thinkers on the left and right—especially those who know anything about Russia, the surveillance apparatus, and intelligence bureaucracy—that the Russiagate-collusion theory that was supposed to end Trump’s presidency within six months has sprung more than a few holes. Worse, it has proved to be a cover for U.S. intelligence and law-enforcement bureaucracies to break the law, with what’s left of the press gleefully going along for the ride. Where Watergate was a story about a crime that came to define an entire generation’s oppositional attitude toward politicians and...